Richard Marxhas knownKeith Urbanfor decades, but the pop music extraordinaire still has a hard time totally understanding what’s going on in the mind of the country music superstar.

And while the fellow Grammy winners have seen much success together as writing partners for Urban’s hit songs such as “Everybody,” “Better Life,” and the No. 1 smash “Long Hot Summer,” there wasone particular songthat Urban never seemed to warm up to.

Richard Marx and Keith Urban.Rick Diamond/Getty

NASHVILLE, TN - JANUARY 25: Richard Marx and Keith Urban attend the BMI & ASCAP #1 Party For “Long Hot Summer” written by Keith Urban and Richard Marx held at Cabana on January 25, 2012 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images for BMI)

For years, the song simply took up space in a folder on Marx’s laptop, until the accomplished singer/songwriter went back and gave it a listen one more time. And now, it’sthissong that serves as the first of five country songs from Marx’s forthcoming albumSongwriter, set for release on Sept. 30.

“I sent Keith a voice note saying that I was putting out ‘One Day Longer,’ and he texts me back and he says, ‘I have no recollection of that song, but it sounds really good,'” Marx laughs. “He sounded like he couldn’t believe that we would write something so good together.”

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RICHARD MARX

The two creative visionaries first started working together when Marx was just dipping his creative toe into Nashville’s thriving songwriting community. And during one of those visits, Marx met Matt Rollings, who produced Urban’s first album in the states back in 1999.

“Matt would always say how he was working with Keith and that he reminded him of me, even though he was country,” says Marx, laughing at the memory. “He thought we would hit it off.”

And the two ended up doing just that. The next time Marx was in Music City, he met Urban for an afternoon writing session that ended up lasting two days. However, there wasn’t much songwriting going on.

“We never finished a song,” laughs Marx, who at the time was hitting the big time as a solo artist with songs such as “Hold on to the Nights” and “Don’t Mean Nothing.” “We just ended up shooting pool and talking at his house. But yeah, that’s when this amazingly successful story began.”

As with everything else Marx does, he did get the thumbs up on “One Day Longer” fromwife Daisy Fuentes.

RICHARD MARX

“Daisy loves this one,” says Marx of his wife, who has also lived her life in the spotlight as an actress, model and business owner. “And I would say that that’s not a given with her. She’s honest when it comes to the music that I do.”

A multi-genre project that has Marx delving into everything from country to rock to pop,Songwriternot only serves as yet another creative outlet for him, but an excuse to write with some of the finest out there, including Burt Bacharach,Darius RuckerandChris Daughtry.

source: people.com